linux-kernel - Re: [PATCH 1/4] ALSA: Added jack detection kcontrol support

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Date:	Mon, 29 Jul 2013 14:05:52 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Felipe Tonello <eu@...ipetonello.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org,
	David Henningsson <david.henningsson@...onical.com>,
	Wang Xingchao <xingchao.wang@...ux.intel.com>,
	Jaroslav Kysela <perex@...ex.cz>
Subject: Re: [PATCH 1/4] ALSA: Added jack detection kcontrol support

At Sat, 27 Jul 2013 13:25:24 +0100,
Mark Brown wrote:
> 
> On Fri, Jul 26, 2013 at 04:13:40PM -0700, Felipe Tonello wrote:
> > On Fri, Jul 26, 2013 at 3:48 PM, Mark Brown <broonie@...nel.org> wrote:
> 
> > >> > What I'd expect to happen here is that for multi function jacks we
> > >> > create a control per function if the controls are valid.
> 
> > Ok, so the idea is just to change the control to type integer instead
> > of boolean, right?
> > Because as you say, the user will be able to check the type of jack
> > based on the status value, right?
> 
> It might be more idiomatic and more compatible with userspace to create
> multiple controls for the jack, there was some discussion of this in the
> past I think but I can't remember the result.

I also forget the end result :)

Another option would be to make an enum control, but multiple boolean
controls are easier in the end.  The headset controls of HD-audio are
represented in that way, too (because HD-audio specification can't
tell better).


Takashi
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